That would achieve 1 of the 3 wins.
Of course you can combine both approaches for even greater gains. But Claude Code and like five alternatives gaining an efficient tool-calling paradigm where console output is interpreted by Haiku instead of Opus seems like a much quicker win than adding an LLM env flag to every cli tool under the sun
Edit: Just remembered that sometimes, I see claude running the build step in two terminals, side-by-side at nearly the same time :D